Polished Green Opal rock GREEN84 stripey 180 mm x 130 mm

180 mm x 130 mm x 50 mm thick

Dimensions at widest points approximately 90 mm x 90 mm x 90 mm thick

160 mm x 110 mm x 8 mm thick

An as yet unidentified stromatolite

naturally weathered back

Polished Green Opal rock GREEN84 stripey 180 mm x 130 mmGREEN84 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 225 mm x 85 mm x 65 mm thick Weighs 1,315 grams Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia. The green colouration is caused by traces of nickel and or chromium. Sometimes it exhibits striking contrasting veins of magnesite.